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EC number: 476-160-4
CAS number: 54807-34-0
The substance is an organic white powder at
20 ºC and 1013 hPa with no odour.
The melting temperature of the test material
has been determined to be 266°C. NaDMH decomposed on melting according
to EC Method A.1.
As the test material has been determined to
decompose on melting, no value for boiling temperature could be
determined. The calculated value of boiling temperature is greater than
360°C (633 K).
The relative density of the test material
has been determined to be 1.40 at 22.5 °C according to EC Method A.3.
Particle size distribution:
The substance will only be imported and used
as a component of a liquid preparation. Therefore a particle size
distribution study was not performed.
The vapour pressure of NaDMH has been
determined to be less than 1.4 x 10-4 Pa at 25°C according to EC Method
A study according to EU Method A.8 was
carried out. The partition coefficient of the test material has been
determined to be 0.343 at 25°C, log Pow = -0.465.
A standard EEC A6 Method was not applicable due to the
extremely high water solubility of the substance (>10000 mg/L).
Substances having a surface tension below 60
mN/m are regarded as being surface-acitve. The surface tension of a 1.13
g/L solution of NaDMH has been determined to be 60.9 mN/m at 24°C. The
test material is considered not to be a surface-active material.
Flash point study is not applicable for
solid substances therefore, a flammability study was performed.
The auto-ignition temperature of the test
item was determined according to EU Method A.16. The test material has
been determined not to have a relative self-ignition temperature below
its melting temperature (>266°C).
NaDMH has been determined to be not highly
flammable as it did not propagate combustion over the 200 mm of the
preliminary screening test.
Explosiveness / Oxidising properties:
There are no chemical groups present
that would imply explosive or
oxidising properties therefore the result has been predicted negative.
Stability in organic solvents:
The stability in organic solvents is only
required if stability of the substance is considered to be critical. The
stability test in organic solvents is not considered to be critical for
NaDMH as it is produced as aqueous solution and has been isolated only
for testing/notification purposes.
For the dissociation constant a result of
9.19 pKa was determined for the read-across substance
5,5-dimethylhydantoin (DMH) from e.m.f measurements on the cell
H2/Acid-base solution/saturated KCl/HgCl/Hg.
NaDMH is a solid therefore the viscosity
study is not applicable.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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